John Ed, look it up on the web address......tcceramics.com. The phone number is 206 363 5010. Speak with Rich and tell him you talked to Ken Masters about putting it on his bus. He will gladly send you a sample. It IS not an insulation. It is a ceramic reflective material. It keeps the heat from absorbing into the interior. You could burn your hand on the heat being absorbed before spraying the ceramics, and now, you can not even feel any warmth when touching. So, it would be the same thing if you sprayed it in the engine area or gen area. It will keep the heat out of the interior, or, from being absorbed back into the bus. BTW, the sample we were sent was a piece of the black, and it worked with the ice cube test. So, I dont think that would make a difference. We got black for the engine area and the gen area, and the glass behind the front cabinets. Also, it will keep heat in an area also, so, that is why we spayed the interior of the bus. When heating the bus in the winter, it will reflect the heat you are using, so that it stays inside the bus. It makes sense to me, given the way it works on the outside. It is suppose to also help with noise, but, at this point, we have no proof of it, just what we are told by the company. Anyhow, we were very leary in the beginning also, but after questioning Rich many times, reading reviews of it, and then getting the sample, we are very convinced that it is what they say. It isnt cheap, so, we would not have spent the money otherwise. BTW, the sample they send you is kinda crumply, but, it isnt when you spray it on. Once it dries, you cant chisle it off, literally. Once it dries, it is there. That is why I said it can be powerwashed. Anyhow, talk to Rich, get a sample, and you will see
Good luck, let us know how it goes.